Parts list (not including tools or experiments) for Sandwich, the line-following robot.
From the book Robot Building for Beginners - Second Edition. Apress ISBN: 978-1-4302-2748-9. Copyright 2002-2011 by David Cook. Spreadsheet updated May 2011.
You can save money by buying a "K SAND" Sandwich kit for $49.95 from Solarbotics.
Section
Motherboard
Motherboard
Motherboard
Description
150 ohm 1/2 watt resistor. 1/4 watt also fine.
1 kilohm 1/2 watt resistor. 1/4 watt also fine.
20 kilohm variable multiturn potentiometer
Motherboard Cadmium-sulfide photoresistor approx 1/4" diameter
Motherboard Black paint marker for backs of photoresistors
LED white T1 3/4 (5 MM). Diffused or frosted with wide angle
Motherboard preferable
Motherboard 1N5817 Schottky diode
Motherboard 2907A PNP transistor
LED yellow T1 3/4 (5 MM). Diffused or frosted with wide angle
Motherboard preferable
LED green T1 3/4 (5 MM). Diffused or frosted with wide angle
Motherboard preferable
Motherboard LM393 comparator chip 8-pin DIP
Motherboard 8 pin DIP IC socket
Motherboard Sandwich printed circuit board
Motherboard >=100 uF 16 V capacitor
Motherboard 0.1 uF 16 V capacitor
Motherboard
Motherboard
Motherboard
Guts
Guts
Guts
Guts
Test point loops
2 pin Molex KK header
4 pin Molex KK header
2 pin Molex KK housing
4 pin Molex KK housing
Molex KK crimp
9 V battery clip holder, vertical
Guts
Guts
Guts
9 V battery clip holder screw
9 V battery snap
9 V alkaline battery
Guts
Guts
Guts
LED red, high brightness T1 3/4 (5 MM). Wide angle preferable
SPST power switch
DPDT center off switch
Guts
Body
Body
Body
Body
Body
Body
Body
Body
Body
Body
Body
Body
Coupler
225 RPM motor
49.6 x 28 VR LEGO tire
49.6 x 28 VR LEGO hub
Ziploc 2.5 cup square container
Hole template stickers for Ziploc container
Spacers 1/2-inch long #4 hex threaded
Spacers 1/2-inch long #4 round thru-hole
Nylon washers
Stainless steel #4 hex nut
Large washer for #4 on battery holder (optional)
Circuit board mounting screws #4-40 1.5 inch
M2.6 x 6 mm motor mounting screws
Mini m&m's candy mega tube
Devcon All Purpose 5 Minute Epoxy clear S-208
Coupler
Coupler
Coupler
Coupler
Coupler
Coupler
Guts
Guts
Guts
Body
Schematic ID
R7, R8, R9, R20
R1, R17, R18
R2, R10
R4, R5, R6, R7
LED9, LED10
D1, D2, D3
Q7, Q8
LED7, LED11,
LED13
LED8, LED12,
LED14
IC1
C1
C2
TP1, TP2, TP3,
TP4
LED20, LED21,
LED22
SW1
SW2
M1, M2
Total
Quantity
4
3
2
Example Supplier
http://www.digi-key.com/
http://www.digi-key.com/
http://www.digi-key.com/
Supplier Part Number
150H
1.0KH
490-2881
Price
Each for
Quantity 1
$
0.06
$
0.06
$
1.36
Price For
1 Robot
$
0.25
$
0.19
$
2.72
Quantity
Needed
For 50
Robots
200
150
100
Price
Each For
Quantity
For 50
Robots
$ 0.02
$ 0.02
$ 0.80
Price
Each
Robot
For 50
Robots
Comments
$ 0.09
$ 0.07
$ 1.61 Alternative: Solarbotics RT20k, Digi-Key CT94EW203
4 http://www.goldmine-elec.com/
G15177
$
0.50
$
2.00
200 $
0.50
$
1 http://www.mcmaster.com/
$
3.53
$
3.53
5 $
3.53
$
2 http://www.digi-key.com/
3 http://www.digi-key.com/
2 http://www.digi-key.com/
16625T25
(part numbers change too
often)
1N5817DICT
PN2907ABUFS
Be careful here! How do you guarantee a four matched set if you only buy four?
2.00 Might need to buy a couple of grab bags #G14025 to get four matching.
Alternative: Testors black paint for models can be found at local hobby and
0.35 hardware stores.
$
$
$
1.29
0.44
0.49
$
$
$
2.58
1.32
0.98
100 $
150 $
100 $
0.86
0.23
0.14
$
$
$
1.72 To further reduce costs, look for bags of cheap diffused or frosted LEDs on eBay.
0.70
0.28 Less expensive at Mouser PN2907ATFR
3 http://www.digi-key.com/
LTL-4253
$
0.52
$
1.56
150 $
0.20
$
0.61 To further reduce costs, look for bags of cheap diffused or frosted LEDs on eBay.
3
1
1
1
1
1
http://www.digi-key.com/
http://www.digi-key.com/
http://www.jameco.com/
http://www.solarbotics.com/
http://www.digi-key.com/
http://www.digi-key.com/
LTL-4233
LM393N
51570
SANDPCB
P5140
BC1084CT
$
$
$
$
$
$
0.52
0.40
0.12
12.00
0.33
0.36
$
$
$
$
$
$
1.56
0.40
0.12
12.00
0.33
0.36
150
50
50
50
50
50
$ 0.20
$ 0.27
$ 0.09
$ 12.00
$ 0.16
$ 0.13
http://www.digi-key.com/
http://www.digi-key.com/
http://www.digi-key.com/
http://www.digi-key.com/
http://www.digi-key.com/
http://www.jameco.com/
WM4200
WM4202
WM2000
WM2002
WM1114
105794
$
$
$
$
$
$
$
0.44
0.71
0.31
0.45
0.26
0.35
$
$
$
$
$
$
$
2.20
0.71
1.55
0.45
3.57
0.35
200
250
50
250
50
700
50
$
$
$
$
$
$
$
0.11
0.29
0.07
0.16
0.09
0.32
1 http://www.mcmaster.com/
1 http://www.digi-key.com/
1 http://www.digi-key.com/
91772A106
BS6I-MC
N145
$
$
$
0.04
0.48
2.23
$
$
$
0.04
0.48
2.23
50 $
50 $
50 $
0.03
0.44
2.00
3 http://www.digi-key.com/
1 http://www.digi-key.com/
1 http://www.jameco.com/
365-1203
EG1892
22841
$
$
$
0.20
3.10
1.49
$
$
$
0.60
3.10
1.49
150 $
50 $
50 $
0.16
2.57
1.25
$
$
$
$
$
$
$
$
$
$
$
$
$
$
17.95
0.40
0.50
0.70
0.00
0.65
0.22
0.05
0.03
0.07
0.06
0.05
0.99
4.17
$
$
$
$
$
$
$
$
$
$
$
$
$
$
35.90
0.80
1.00
0.70
0.00
2.59
0.87
0.65
0.14
0.07
0.26
0.20
0.99
4.17
100
100
100
50
100
200
200
600
250
50
200
200
50
5
$ 14.35
$ 0.40
$ 0.50
$ 0.66
$ 0.00
$ 0.55
$ 0.20
$ 0.04
$ 0.03
$ 0.07
$ 0.06
$ 0.05
$ 0.99
$ 4.17
100
100
100
100
100
100
50
0
0
$
$
$
$
$
$
$
4
5
1
5
1
14
1
2
2
2
1
2
4
4
12
5
1
4
4
1
1
http://www.jameco.com/
http://www.bricklink.com/
http://www.bricklink.com/
http://www.doitbest.com/
homemade
http://www.digi-key.com/
http://www.digi-key.com/
http://www.digi-key.com/
http://www.mcmaster.com/
http://www.mcmaster.com/
http://www.mcmaster.com/
http://www.mcmaster.com/
Walgreens drug store
http://www.mscdirect.com/
162191 or HNGH12-1324Y-R
Brass tubing 3/16" outer diameter with 0.014 inch thick wall
Brass tubing 7/32" outer diameter with 0.014 inch thick wall
Brass tubing 1/4" outer diameter with 0.014 inch thick wall
Brass tubing 9/32" outer diameter with 0.014 inch thick wall
3 unit LEGO cross axles
1/8 inch #4-40 machine screw (as setscrew)
Dark/light switch label
Various colors of heat-shrink tubing
Various colors and lengths of #22, #24, or #26 gauge wire
2
2
2
2
2
2
1
http://www.mcmaster.com/
http://www.mcmaster.com/
http://www.mcmaster.com/
http://www.mcmaster.com/
http://www.bricklink.com/
http://www.mcmaster.com/
homemade
8859K22
8859K23
8859K24
8859K25
"black technic axle"
91772A103
$
$
$
$
$
$
$
0.06 $
0.13 $
0.15 $
0.16 $
0.10 $
0.04 $
0.00 $
$
$
0.12
0.26
0.29
0.33
0.20
0.09
0.00
-
Roll of Scotch Brand Long Mask 1-inch #2090
1 http://www.mcmaster.com/
7776A23
$
5.28
5.28
model #10878, SKU 611136
1902CK
878K
3158K
91841A005
90313A101
91772A119
90353A112
261164
$
$ 101.56
5 $
$ 0.61 To further reduce costs, look for bags of cheap diffused or frosted LEDs on eBay.
$ 0.27 Alternative: Solarbotics L393
$ 0.09 Alternative: http://www.digikey.com/ 3M5473
$ 12.00
$ 0.16 Optional. Not really needed. Alternative: Mouser 647-UFW1C221MED
$ 0.13 Optional. Not really needed.
Use a piece of wire. The v3.0 (and up) boards have two holes at each test point so
that you can make a nice little loop.
$
$ 0.57
$ 0.29
$ 0.33
$ 0.16
$ 1.22 Get bulk, not tape or reel, because they are a pain to separate
$ 0.32 Alternative: http://www.mouser.com/ 534-080 or 534-095
Alternative: slotted is 91792A106. Since you only need 1, consider a local
$ 0.03 hardware store.
$ 0.44 Alternative: Mouser 123-4016-GR, Jameco 216452
$ 2.00 Alternative: Any alkaline 9V brand from a local store is fine.
Any type of high brightness LED will do just fine. The wider the angle the better.
Can find some as low as $0.10 each. http://www.goldmine-elec.com has a good
$ 0.48 selection.
$ 2.57 Alternative: EG1889
$ 1.25
Formerly GH12-1324Y225R (Jameco keeps changing part numbers!), formerly
$ 28.70 162190 or GH12-1324Y (Non ROHS certified)
$ 0.80 On BrickLink, search for "VR" and then scroll
$ 1.00 On BrickLink, search for "VR" and then scroll
$ 0.66 Need to cut holes. Sold in quantity 5.
$ 0.00
$ 2.19
$ 0.80
$ 0.43
$ 0.14 Try nylon nuts (94812A112) as a vibration-resistant alternative.
$ 0.07 Or just use a nylon washer like the rest of the robot
$ 0.26 Choose 91792A119 for slotted head.
$ 0.20
$ 0.99 Need to cut to length and make center hole.
$ 0.42 Alternative: Pick some up at a local hardware store.
0.06 $
0.13 $
0.15 $
0.16 $
0.10 $
0.04 $
0.00 $
$
$
5.28
0.12
0.26
0.29
0.33
0.20
0.09
0.00
-
Forced to buy 12 pieces of 12 inches (304 mm) each. Try a local hardware store.
Forced to buy 10 pieces of 12 inches each. Try a local hardware store.
Forced to buy 8 pieces of 12 inches each. Try a local hardware store.
Forced to buy 8 pieces of 12 inches each. Try a local hardware store.
On BrickLink.com, search for "black technic axle" and then scroll
Sold in quantity 100. Choose 91792A103 for slotted head.
Alternative: http://www.officedepot.com/ #745133. Or, pick up a roll of 1" wide
0.53 blue masking tape at a local store.
If you're only making one robot, you'll end up with extra parts left over due to
minimum purchase quantities. The price will be higher than shown for 1 robot,
$ 68.82 since the cost of the leftover parts is not included.
$